TIFFMEDIAN(1) - phpMan

TIFFMEDIAN(1)                        General Commands Manual                        TIFFMEDIAN(1)



NAME
       tiffmedian - apply the median cut algorithm to data in a TIFF file

SYNOPSIS
       tiffmedian [ options ] input.tif output.tif

DESCRIPTION
       tiffmedian  applies  the  median  cut algorithm to an RGB image in input.tif to generate a
       palette image that is written to output.tif.  The generated colormap has, by default,  256
       entries.  The image data is quantized by mapping each pixel to the closest color values in
       the colormap.

OPTIONS
       -c     Specify the compression to use for data written to the output  file:  none  for  no
              compression, packbits for PackBits compression, lzw for Lempel-Ziv & Welch compres-
              sion, and zip for Deflate compression.  By default tiffmedian  will  compress  data
              according to the value of the Compression tag found in the source file.

              LZW  compression  can  be  specified  together with a predictor value.  A predictor
              value of 2 causes each scanline of the output image to undergo  horizontal  differ-
              encing  before it is encoded; a value of 1 forces each scanline to be encoded with-
              out differencing.  LZW-specific options are specified by  appending  a  ``:''-sepa-
              rated  list to the ``lzw'' option; e.g.  -c lzw:2 for LZW compression with horizon-
              tal differencing.

       -C     Specify the number of entries to use in the generated colormap.  By default all 256
              entries/colors are used.

       -f     Apply Floyd-Steinberg dithering before selecting a colormap entry.

       -r     Specify  the number of rows (scanlines) in each strip of data written to the output
              file.  By default, tiffmedian attempts to set the rows/strip that no  more  than  8
              kilobytes of data appear in a strip.

NOTES
       This program is derived from Paul Heckbert's median program.

SEE ALSO
       pal2rgb(1), tiffinfo(1), tiffcp(1), tiffcmp(1), libtiff(3TIFF)

       Color  Image  Quantization  for Frame Buffer Display, Paul Heckbert, SIGGRAPH proceedings,
       1982, pp. 297-307.

       Libtiff library home page: http://www.remotesensing.org/libtiff/



libtiff                                  November 2, 2005                           TIFFMEDIAN(1)

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